Loans and Preferred Equity Held for Investment, net - Nonaccrual and Past Due Loans (Details) $ in Thousands	Jun. 30, 2026 USD ($)	Jun. 30, 2026 loan	Jun. 30, 2026 property	Dec. 31, 2025 USD ($) loan	Jun. 30, 2025 loan
Financing Receivable, Past Due [Line Items]
Carrying Value	$ 2,893,663			$ 2,678,315
Denver, Colorado
Financing Receivable, Past Due [Line Items]
Number of loans on nonaccrual status \| loan				1	1
Loan carrying value, nonaccrual	56,600			$ 22,000
Denver, Colorado \| Multifamily
Financing Receivable, Past Due [Line Items]
Number of loans on nonaccrual status		1	1
Denver, Colorado \| Office
Financing Receivable, Past Due [Line Items]
Number of loans on nonaccrual status \| loan		1
Baltimore, Maryland
Financing Receivable, Past Due [Line Items]
Number of loans on nonaccrual status \| loan		1		1
Loan carrying value, nonaccrual	15,100			$ 14,700
Commercial mortgage
Financing Receivable, Past Due [Line Items]
Carrying Value	2,893,663			2,678,315
Commercial mortgage \| Current or Less Than 30 Days Past Due
Financing Receivable, Past Due [Line Items]
Carrying Value	2,821,918			2,641,623
Commercial mortgage \| 30-59 Days Past Due
Financing Receivable, Past Due [Line Items]
Carrying Value	56,640			0
Commercial mortgage \| 60-89 Days Past Due
Financing Receivable, Past Due [Line Items]
Carrying Value	0			0
Commercial mortgage \| 90 Days or More Past Due
Financing Receivable, Past Due [Line Items]
Carrying Value	$ 15,105			$ 36,692